標題: Cryogenic analog-to-digital converters using spread spectrum technology for coherent receivers
作者: Shiao, Yu-Shao Jerry
Chiueh, Tzihong
Hu, Robert
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: coherent receiver;spread spectrum;analog-to-digital converter;digitizer
公開日期: 1-Jan-2012
摘要: We propose analog-to-digital converters (ADCs) using spread spectrum technology in cryogenic receivers or at warm room temperature for coherent receiver backend systems. As receiver signals are processed and stored digitally, ADCs play a critical role in backend read-out systems. To minimize signal distortion, the down-converted signals should be digitized without further transportation. However, digitizing the signals in or near receivers may cause radio frequency interference. We suggest that spread spectrum technology can reduce the interference significantly. Moreover, cryogenic ADCs at regulated temperature in receiver dewars may also increase the bandwidth usage and simplify the backend digital signal process with fewer temperature-dependant components. While industrial semiconductor technology continuously reduces transistor power consumption, low power high speed cryogenic ADCs may become a better solution for coherent receivers. To examine the performance of cooled ADCs, first, we design 4 bit 65 nm and 40 nm CMOS ADCs specifically at 10 K temperature, which commonly is the second stage temperature in dewars. While the development of 65 nm and 40 nm CMOS ADCs are still on-going, we estimate the ENOB is 2.4 at 10 GSPS, corresponding to the correlation efficiency, 0.87. The power consumption is less than 20 mW.
URI: http://dx.doi.org/10.1117/12.924627
http://hdl.handle.net/11536/135477
ISBN: 978-0-8194-9153-4
ISSN: 0277-786X
DOI: 10.1117/12.924627
期刊: MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VI
Volume: 8452
起始頁: 0
結束頁: 0
Appears in Collections:Conferences Paper


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